<template>
  <div class="component-upload-image">
    <el-upload
      ref="upload"
      multiple
      action=""
      :http-request="handleUpload"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      name="file"
      :on-remove="handleRemove"
      :show-file-list="true"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }"
    >
      <i class="el-icon-plus"></i>
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      （请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的图片）
      <slot name="explan"></slot>
    </div>
    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
    >
      <img v-imgError style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script>
import OSS from 'ali-oss'
import { getOssInfo } from '@/request/api'
export default {
  model: {
    prop: 'value',
    event: 'input'
  },
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 1,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 1.5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      fileList: [],
      oss: null
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(",");
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            item = { name: item, url: item };
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  created() {
    this.initOSS()
  },
  methods: {
    async initOSS() {
      const res = await getOssInfo()
      if (res) {
        const { accessKey, accessSecret, bucket, endpoint } = res.data
        this.oss = new OSS({
          // 阿里云oss相关信息
          region: endpoint.split('.')[0],
          accessKeyId: accessKey,
          accessKeySecret: accessSecret,
          bucket: bucket
        })
      }
    },
    handleUpload(option) {
      const { file } = option
      const randomName = this.getFileNameUUID()
      const key = 'datarOSS/' + randomName + file.name // 设置上传路径
      const ossOptions = {
        headers: {
          'Content-Type': file.type,
          'Content-Disposition': 'inline'
        }
      }
      this.oss
        .put(key, file, ossOptions)
        .then((result) => {
          this.handleUploadSuccess(result.url, file)
        })
        .catch((error) => {
          // 上传失败的操作
          this.handleUploadError()
        })
    },
    getFileNameUUID() {
      function rx() {
        return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1)
      }
      return `${+new Date()}_${rx()}${rx()}`
    },
    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit("input", this.listToString(this.fileList));
      }
    },
    // 上传成功回调
    handleUploadSuccess(fileUrl, file) {
      this.$refs.upload.clearFiles()
      this.$modal.closeLoading()
      // 如果上传成功
      this.uploadList.push({ name: file.name, url: fileUrl })
      this.number++
      console.log('this.uploadList>>>', this.uploadList, this.number)
      if (this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList)
        this.uploadList = []
        this.number = 0
        this.$emit('input', this.listToString(this.fileList))
      }
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        this.$modal.msgError(
          `文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`
        );
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传图片，请稍候...");
      return true
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError("上传图片失败，请重试");
      this.$modal.closeLoading();
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>
<style scoped lang="less">
::v-deep .el-upload--picture-card {
  width: 170px;
  height: 170px;
  display: flex;
  justify-content: center;
  align-items: center;
}
::v-deep .hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}
::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>
